Using Cassava Pit Waste as Light Weight Aggregate for Hollow Load Bearing Concrete Masonry Mixed with Rice Husk Ash Product
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Abstract
This research aims to develop the rice husk ash concrete blocks mixed with cassava pit waste. The mixing ratio among Portland cement type1: rice husk ash: quarry dust: water reducer type A: tap water that included 0.7: 0.3: 10: 0.02: 0.6 by weight of admixtures. The quarry dust was replaced by cassava pit waste in 0%, 1%, 3%, 6%, 9% and 12 % by weight of quarry dust. The 6 mixing ratios of concrete block samples were casted same as the ordinary concrete blocks and were tested the properties according to the TIS.57-1990 standard. From the results, the best proportion of concrete block mixed with coconut shell ash is 3% replacement of cassava pit waste. The proper ratios of cassava pit waste can decrease the density or weight and increase the thermal insulation of concrete blocks. However, the over amounts of cassava pit waste can increase the water absorption and decrease the compressive strength properties of concrete blocks.
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